A great search for videos - Mobento allows you to search by category, organization producing the video, speakers,and length of video. You can refine your search by combining selections from each of those menus. http://www.mobento.com/
Math in the Movies - This site houses a collection of movie clips in which mathematics appears. To view the movies in a larger mode or on the iPhone/iPad or to even add one of the clips into a presentation, choose the QuickTime iPod version. Currently they are .m4v files.
The Futures Channel - Videos are about 2.5 - 6 minutes long with a few exceptions that might be longer. Many have lessons and or activities that can be used in combination with the video. Sign up for their weekly newsletters to find the currently showing videos.
Problem sets and additional resourcesto use with movies on the Futures Channel
Video Lectures in Mathematics - This website contains visual links to a broad range of math videos. For daily tweets and links to interesting math websites, follow mathematicsprof.
WatchKnowLearn- "WatchKnowLearn has indexed over 33,000+ educational videos, placing them into a directory of over 3,000 categories. The videos are available without any registration or fees to teachers in the classroom and to students at home 24/7."
WOW Math.org - Over 500 videos that explain and demonstrate solving problems in Algebra I, Algebra II, and Calculus.
(KR) Pythagorean's Theorem - This YouTube video is a great short clip to show students the meaning behind Pythagorean's Theorem. Students don't visualize the WHY the sides are squared and how the sums of the bases squared is equivalent to the hypotenuse squared. This video really demonstrates the Theorem and is intriguing enough for students to use as a memory tool. http://www.youtube.com/watch?feature=player_embedded&v=CAkMUdeB06o#!
Teacher Tube has some high quality videos on a lot of subjects. Check http://www.teachertube.com/ and as they say on their Twitter Profile - "Teach the World."
Other Video Sites to check out: